Exhaust gas post-processing device and engine

Abstract

The exhaust gas post-processing device includes: an exhaust gas post-processing unit into which an exhaust gas is introduced; a drain pipe connected to a lower portion of the exhaust gas post-processing unit; and a junction member. The junction member includes an introduction flow path, one end of which is an introduction port connected to the drain pipe, the introduction flow path extending in a horizontal direction from the introduction port, and the other end of the introduction flow path being an introduction-side gas vent hole opened to an outside. A discharge flow path is connected to a lower portion of the introduction flow path, that extends, in the horizontal direction, in a direction intersecting the introduction flow path, and an end portion of the discharge flow path being a discharge port opened to the outside. The exhaust gas post-processing device further includes a drainage pipe connected to the discharge port.

The invention claimed is: 
     
       1. An exhaust gas post-processing device comprising:
 an exhaust gas post-processing unit into which an exhaust gas is introduced; 
 a drain pipe connected to a lower portion of the exhaust gas post-processing unit; and 
 a junction member, 
 wherein the junction member has:
 an introduction flow path, one end of which is an introduction port connected to the drain pipe, the introduction flow path extending in a horizontal direction from the introduction port, and the other end of the introduction flow path being an introduction-side gas vent hole opened to an outside; and 
 a discharge flow path connected to a lower portion of the introduction flow path, the discharge flow path extending, in the horizontal direction, in a direction intersecting the introduction flow path, and an end portion of the discharge flow path being a discharge port opened to the outside, 
 
 wherein the exhaust gas post-processing device further comprises a drainage pipe connected to the discharge port, 
 wherein an end portion of the discharge flow path located on an opposite side of the discharge port in an extending direction of the discharge flow path is a discharge-side gas vent hole opened to the outside; 
 and wherein the discharge flow path includes: 
 a main discharge flow path that includes the discharge port and is connected to the introduction flow path, and 
 a discharge-side gas vent flow path that includes the discharge-side gas vent hole and is connected to the main discharge flow path, and 
 wherein a flow path cross-sectional area orthogonal to the discharge-side gas vent flow path provided in the extension direction of the discharge flow path is smaller than a flow path cross-sectional area of the main discharge flow path. 
 
     
     
       2. The exhaust gas post-processing device according to  claim 1 ,
 wherein the introduction flow path includes:
 a main introduction flow path that includes the introduction port and is connected to the discharge flow path, and 
 an introduction-side gas vent flow path that includes the introduction-side gas vent hole and is connected to the main introduction flow path, and 
 
 wherein the main introduction flow path is inclined downward while directed from the introduction port toward an intersection portion of the main introduction flow path with the discharge flow path in a direction of a main discharge flow. 
 
     
     
       3. The exhaust gas post-processing device according to  claim 1 ,
 wherein the discharge-side gas vent flow path is located at an upper portion of the main discharge flow path. 
 
     
     
       4. The exhaust gas post-processing device according to  claim 1 ,
 wherein the discharge flow path includes:
 a main discharge flow path that includes the discharge port and is connected to the introduction flow path, and 
 a discharge-side gas vent flow path that includes the discharge-side gas vent hole and is connected to the main discharge flow path, and 
 
 wherein, in a direction of a main discharge flow, the main discharge flow path is inclined downward from an intersection portion of the main discharge flow path with the introduction flow path toward the discharge port. 
 
     
     
       5. The exhaust gas post-processing device according to  claim 1 ,
 wherein a plurality of exhaust gas post-processing units are provided, and 
 wherein the junction member includes a plurality of the introduction flow paths, each introduction flow path corresponding to each of the plurality of the exhaust gas post-processing units. 
 
     
     
       6. The exhaust gas post-processing device according to  claim 5 ,
 wherein the plurality of introduction flow paths are intersected with each other and arranged in a vertical direction. 
 
     
     
       7. The exhaust gas post-processing device according to  claim 5 ,
 wherein two exhaust gas post-processing units are arranged horizontally, 
 the junction member is located between the two exhaust gas post-processing units, and 
 the drainage pipe extends from the junction member to one side of an arrangement direction of the two exhaust gas post-processing units. 
 
     
     
       8. The exhaust gas post-processing device according to  claim 7 ,
 wherein the plurality of introduction flow paths are intersected with each other and arranged in a vertical direction. 
 
     
     
       9. An engine comprising:
 the exhaust gas post-processing device according to  claim 1 ; and 
 an engine main body configured to discharge exhaust gas. 
 
     
     
       10. The exhaust gas post-processing device according to  claim 1 ,
 wherein the introduction flow path includes:
 a main introduction flow path that includes the introduction port and is connected to the discharge flow path, and 
 an introduction-side gas vent flow path that includes the introduction-side gas vent hole and is connected to the main introduction flow path, and 
 
 wherein a flow path cross-sectional area orthogonal to the introduction-side gas vent flow path provided in an extension direction of the introduction flow path is smaller than a flow path cross-sectional area of the main introduction flow path. 
 
     
     
       11. The exhaust gas post-processing device according to  claim 10 ,
 wherein the main introduction flow path is inclined downward while directed from the introduction port toward an intersection portion of the main introduction flow path with the discharge flow path in a direction of a main discharge flow. 
 
     
     
       12. The exhaust gas post-processing device according to  claim 10 ,
 wherein a plurality of exhaust gas post-processing units are provided, and 
 wherein the junction member includes a plurality of the introduction flow paths, each introduction flow path corresponding to each of the plurality of the exhaust gas post-processing units. 
 
     
     
       13. The post-processing device according to  claim 10 ,
 wherein the introduction-side gas vent flow path is located at an upper portion of the main introduction flow path. 
 
     
     
       14. The exhaust gas post-processing device according to  claim 13 ,
 wherein the main introduction flow path is inclined downward while directed from the introduction port toward an intersection portion of the main introduction flow path with the discharge flow path in a direction of a main discharge flow. 
 
     
     
       15. An engine comprising:
 the exhaust gas post-processing device according to  claim 10 ; and an engine main body configured to discharge exhaust gas.